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Selling mid-to-high-end network products:Switch/Router/Firewall/Line Card and various accessories from mainstream brands such as Cisco, HUAWEI, H3C, Juniper, Brocade, HP, F5, FortiGate, A10 Networks, etc.
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+86 18038172140
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computing system ---- CPU
power system
interface system
storage system
Flash: Hard drive, store iOS and configuration commands
RAM: memory
ROM: read only memory
Description:
1ROM function: boot system, password recovery, system recovery or upgrade
Composition: bootstrap program: bootloader, used to boot the operating system
Switch program: used for password recovery and system upgrade
POST program: used to implement power-on self-test
power-on self-test POST
load and run bootstrap from the ROM to start the microcode
looking for IOS image files (flash)
loading IOS image file (RAM)
looking for a configuration file (NVRAM)
load the configuration file (RAM)
normal operation
The hardware structure of the Cisco switch and the startup process of the switch are introduced here. If you have other needs, please consult our online customer service.